Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
visit ASHRAE's Bookstore.
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| thermal delay |
1. time period between the energization of a heat‑producing
device and the measurable effect of the heat produced. 2. lag in response of an
external temperature change to reach equilibrium conditions. |
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| thermal diffusion | phenomenon in which a
temperature gradient in a mixture of fluids gives rise to a flow of one
constituent relative to the whole mixture |
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| thermal diffusivity |
physical quantity
that determines the rate of heat propagation in transient‑state processes.
Thermal conductivity divided by the product of density and specific heat. Unit:
ft2/s or m2/s. |
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| thermal efficiency |
energy output as a
percentage of the energy input of a machine or process. See also thermal
storage efficiency. |
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| thermal emissivity | radiation property of a
material, evaluated with its surface optically smooth and clean, and of
sufficient thickness to be opaque |
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| thermal emittance |
ratio of the
radiant flux emitted by a body to that emitted by a blackbody at the same
temperature and under the same conditions. |
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| thermal energy meter | metering system capable of
measuring the energy added to or extracted from a fluid stream. Also called Btu
meter, heat meter, thermal meter. |
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| thermal energy source |
origin of heating
or cooling effects. |
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| thermal envelope |
elements of a
structure which enclose conditioned spaces, and which control transmission of
heat, air, and water vapor between the conditioned spaces and the exterior. See
also building thermal envelope. |
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| thermal environment | for human exposure, the
surrounding atmosphere characterized by parameters such as air temperature,
wet-bulb temperature, dew-point temperature, water-vapor pressure, total
atmospheric pressure, relative humidity, and specific humidity |
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